Answer:
O Marathon
Step-by-step explanation:
There is not much, just knowing the distances of different races.
O Marathon - 26.2 miles
O Triathlon - swim of 0.93 miles, a bicycle ride of 24.8 miles, and a run of 6.2 miles
O Sprint - mostly 100, 200, and 400 metres and 100, 220, and 440 yards
O Half Marathon - 13.1 (as it says, half of a marathon)
Hope this helps, have a nice day! :D